code: def gen_local_address(process_index: int) -> str:
      return f"dummy://{process_index}"
  
file_path: mars/mars/oscar/backends/communication/core.py
imports: from typing import Dict, Type
  from urllib.parse import urlparse
  from .base import Client, Server
label_desc: Use image node_id 7 for calling a global function with example usage: gen_local_address(process_index) and returns: str, process_index